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8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path> </svg> </span> <span></span> </div> </div> <div data-target="query-builder.screenReaderFeedback" aria-live="polite" aria-atomic="true" class="sr-only"></div> </query-builder></form> <div class="d-flex flex-row color-fg-muted px-3 text-small color-bg-default search-feedback-prompt"> <a target="_blank" href="https://docs.github.com/search-github/github-code-search/understanding-github-code-search-syntax" data-view-component="true" class="Link color-fg-accent text-normal ml-2"> Search syntax tips </a> <div class="d-flex flex-1"></div> </div> </div> </div> </div> </modal-dialog></div> </div> <div data-action="click:qbsearch-input#retract" class="dark-backdrop position-fixed" hidden data-target="qbsearch-input.darkBackdrop"></div> <div class="color-fg-default"> <dialog-helper> <dialog data-target="qbsearch-input.feedbackDialog" 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3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path> </svg></button> </div> </div> </div> <scrollable-region data-labelled-by="feedback-dialog-title"> <div data-view-component="true" class="Overlay-body"> <!-- '"` --><!-- </textarea></xmp> --></option></form><form id="code-search-feedback-form" data-turbo="false" action="/search/feedback" accept-charset="UTF-8" method="post"><input type="hidden" data-csrf="true" name="authenticity_token" value="ARZXM8z//KMYkI9HfeYyF4mIsM3exXH8EamXMjfKr/qMR9jGYGOPmlmx1L3PgU3c3p80Xq+bTiwB9WGcDhLEhw==" /> <p>We read every piece of feedback, and take your input very seriously.</p> <textarea name="feedback" class="form-control width-full mb-2" style="height: 120px" id="feedback"></textarea> <input name="include_email" id="include_email" aria-label="Include my email address so I can be contacted" class="form-control mr-2" type="checkbox"> 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Catalog"},{"level":2,"text":"pyang","anchor":"pyang","htmlText":"pyang"},{"level":2,"text":"libyang","anchor":"libyang","htmlText":"libyang"},{"level":2,"text":"xym","anchor":"xym","htmlText":"xym"},{"level":1,"text":"XML","anchor":"xml","htmlText":"XML"},{"level":1,"text":"Programming languages","anchor":"programming-languages","htmlText":"Programming languages"}],"lineInfo":{"truncatedLoc":"83","truncatedSloc":"57"},"mode":"file"},"image":false,"isCodeownersFile":null,"isPlain":false,"isValidLegacyIssueTemplate":false,"issueTemplate":null,"discussionTemplate":null,"language":"Markdown","languageID":222,"large":false,"planSupportInfo":{"repoIsFork":null,"repoOwnedByCurrentUser":null,"requestFullPath":"/ietf/authors.ietf.org/blob/main/formal-languages.md","showFreeOrgGatedFeatureMessage":null,"showPlanSupportBanner":null,"upgradeDataAttributes":null,"upgradePath":null},"publishBannersInfo":{"dismissActionNoticePath":"/settings/dismiss-notice/publish_action_from_dockerfile","releasePath":"/ietf/authors.ietf.org/releases/new?marketplace=true","showPublishActionBanner":false},"rawBlobUrl":"https://github.com/ietf/authors.ietf.org/raw/refs/heads/main/formal-languages.md","renderImageOrRaw":false,"richText":"\u003carticle class=\"markdown-body entry-content container-lg\" itemprop=\"text\"\u003e\u003cmarkdown-accessiblity-table\u003e\u003ctable\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003etitle\u003c/th\u003e\n \u003cth\u003edescription\u003c/th\u003e\n \u003cth\u003epublished\u003c/th\u003e\n \u003cth\u003edate\u003c/th\u003e\n \u003cth\u003etags\u003c/th\u003e\n \u003cth\u003eeditor\u003c/th\u003e\n \u003cth\u003edateCreated\u003c/th\u003e\n \u003c/tr\u003e\n \u003c/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003eFormal languages\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003e\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003etrue\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003e2021-12-16 04:44:58 UTC\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003e\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003emarkdown\u003c/div\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cdiv dir=\"auto\"\u003e2021-12-11 22:42:14 UTC\u003c/div\u003e\u003c/td\u003e\n \u003c/tr\u003e\n \u003c/tbody\u003e\n\u003c/table\u003e\u003c/markdown-accessiblity-table\u003e\n\n\u003cp dir=\"auto\"\u003eThere are a number of formal languages used in I-Ds and several tools have been written to help process them.\u003c/p\u003e\n\u003cblockquote\u003e\n\u003cp dir=\"auto\"\u003eMake sure that any use of formal languages conforms with the \u003ca href=\"https://www.ietf.org/about/groups/iesg/statements/formal-languages-use/\" rel=\"nofollow\"\u003eIESG statement on the use of formal languages\u003c/a\u003e.\n{.is-success}\u003c/p\u003e\n\u003c/blockquote\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eABNF\u003c/h1\u003e\u003ca id=\"user-content-abnf\" class=\"anchor\" aria-label=\"Permalink: ABNF\" href=\"#abnf\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eABNF is a general purpose formal grammar notation specified in STD 68 (RFC 5234).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/ietf-tools/bap\"\u003ebap\u003c/a\u003e can extract and validate ABNF. It can be run locally on the command-line, or using \u003ca href=\"https://author-tools.ietf.org/abnf\" rel=\"nofollow\"\u003ethe online services at author-tools.ietf.org\u003c/a\u003e. The utility provides the ability to validate ABNF and to extract ABNF from an I-D or RFC.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen ABNF is used, your I-D must contain a normative reference to RFC 5234, the specification for ABNF.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eMIB modules\u003c/h1\u003e\u003ca id=\"user-content-mib-modules\" class=\"anchor\" aria-label=\"Permalink: MIB modules\" href=\"#mib-modules\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eMIB modules are collections of related objects of SMIv2 management information specified in STD 58 (RFC 2578, RFC 2579, RFC2580).\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAll MIB modules must follow the \"Guidelines for Authors and Reviewers of MIB documents\" (RFC 4181). When using the tools below, please evaluate all diagnostic messages and if in doubt, feel free to check on the \u003ca href=\"https://www.ietf.org/mailman/listinfo/IETFMIBS\" rel=\"nofollow\"\u003eietfmibs mailing list\u003c/a\u003e or with the OPS ADs.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003elibsmi\u003c/h2\u003e\u003ca id=\"user-content-libsmi\" class=\"anchor\" aria-label=\"Permalink: libsmi\" href=\"#libsmi\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.ibr.cs.tu-bs.de/projects/libsmi/download.html?lang=de\" rel=\"nofollow\"\u003elibsmi\u003c/a\u003e suite of tools and is available as a \u003ca href=\"https://command-not-found.com/smilint\" rel=\"nofollow\"\u003epackage\u003c/a\u003e for most operating systems and as an \u003ca href=\"https://www.ibr.cs.tu-bs.de/projects/libsmi/tools/\" rel=\"nofollow\"\u003eonline service\u003c/a\u003e. libsmi contains three command line tools:\u003c/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003esmilint for checking a MIB file\u003c/li\u003e\n\u003cli\u003esmistrip for extracting a MIB from a document\u003c/li\u003e\n\u003cli\u003esmidump for converting a MIB into another format (including YANG)\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp dir=\"auto\"\u003eMIB modules with the correct syntax will compile cleanly using smilint, e.g.:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"smilint -m -s -l 6 -i namelength-32\"\u003e\u003cpre\u003esmilint -m -s -l 6 -i namelength-32\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003erfcstrip\u003c/h2\u003e\u003ca id=\"user-content-rfcstrip\" class=\"anchor\" aria-label=\"Permalink: rfcstrip\" href=\"#rfcstrip\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/mbj4668/rfcstrip\"\u003erfcstrip\u003c/a\u003e extracts code components, YANG modules and SMIv2 (MIB) modules from RFCs and I-Ds, and extracts and unfolds artwork from RFCs and I-Ds in XML format.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eYANG\u003c/h1\u003e\u003ca id=\"user-content-yang\" class=\"anchor\" aria-label=\"Permalink: YANG\" href=\"#yang\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eYANG (Yet Another Next Generation) is a data modeling language for data sent over network management protocols such as NETCONF and RESTCONF specified in RFC 7950, RFC 8340 and many others\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eAll YANG modules must follow the \"Guidelines for Authors and Reviewers of YANG Data Model Documents\" (RFC 8407) and the \u003ca href=\"https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines\" rel=\"nofollow\"\u003eYANG module security considerations\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eWhen YANG is used, your I-D must contain normative references to RFC 8446, RFC 6241, RFC 6242, RFC 8341, and RFC8040.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eYANG Catalog\u003c/h2\u003e\u003ca id=\"user-content-yang-catalog\" class=\"anchor\" aria-label=\"Permalink: YANG Catalog\" href=\"#yang-catalog\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://www.yangvalidator.com/\" rel=\"nofollow\"\u003eYANG Catalog\u003c/a\u003e is a website operated and maintained by the IETF that provides a central resource for the use of YANG, including the \u003ca href=\"https://www.yangvalidator.com/yangvalidator\" rel=\"nofollow\"\u003eYANG Validator\u003c/a\u003e. YANG Catalog is \u003ca href=\"https://github.com/YangCatalog\"\u003eopen source\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003epyang\u003c/h2\u003e\u003ca id=\"user-content-pyang\" class=\"anchor\" aria-label=\"Permalink: pyang\" href=\"#pyang\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/mbj4668/pyang\"\u003epyang\u003c/a\u003e is an open source tool that validates YANG modules and converts them into other formal languages. pyang has a flag \u003ccode\u003e--ietf\u003c/code\u003e that checks RFC 8407 rules.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThe RFC editor ensures that all published YANG modules are formatted consistently using pyang as follows:\u003c/p\u003e\n\u003cdiv class=\"highlight highlight-source-shell notranslate position-relative overflow-auto\" dir=\"auto\" data-snippet-clipboard-copy-content=\"# ensure that the module fits into the line limits of an I-D\npyang --ietf --max-line-length 69 FILE\n\n# format the module\npyang -f yang --keep-comments --yang-line-length 69 FILE\"\u003e\u003cpre\u003e\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e ensure that the module fits into the line limits of an I-D\u003c/span\u003e\npyang --ietf --max-line-length 69 FILE\n\n\u003cspan class=\"pl-c\"\u003e\u003cspan class=\"pl-c\"\u003e#\u003c/span\u003e format the module\u003c/span\u003e\npyang -f yang --keep-comments --yang-line-length 69 FILE\u003c/pre\u003e\u003c/div\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003elibyang\u003c/h2\u003e\u003ca id=\"user-content-libyang\" class=\"anchor\" aria-label=\"Permalink: libyang\" href=\"#libyang\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/CESNET/libyang\"\u003elibyang\u003c/a\u003e is an open source YANG data modelling language parser and toolkit that includes the \u003ca href=\"https://github.com/CESNET/libyang/blob/master/tools/lint/examples/README.md\"\u003eyanglint\u003c/a\u003e command line tool for validation and conversion of the schemas and YANG modeled data.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003exym\u003c/h2\u003e\u003ca id=\"user-content-xym\" class=\"anchor\" aria-label=\"Permalink: xym\" href=\"#xym\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"https://github.com/xym-tool/xym\"\u003exym\u003c/a\u003e is an open source tool for extracting YANG modules from files. See also \u003ca href=\"#rfcstrip\"\u003erfcstrip\u003c/a\u003e.\u003c/p\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eXML\u003c/h1\u003e\u003ca id=\"user-content-xml\" class=\"anchor\" aria-label=\"Permalink: XML\" href=\"#xml\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eProtocol specifications that use XML should always use well-formed XML at a minimum. Sample XML instances included in a specification have to be well-formed, and if the XML is supposed to be valid (according to the current W3C definition of validity), the samples must reference and be validated using an appropriate XML Schema, DTD, or another standard validation mechanism that is structurally and syntactically correct.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eOther guidelines for the use of XML in IETF protocols can be found in RFC 3470. Internet-Drafts that include an XML Schema should include a normative reference to either the W3C XML Schema Definition Language 1.1 \u003ca href=\"https://www.w3.org/TR/xmlschema11-1/\" rel=\"nofollow\"\u003ePart1\u003c/a\u003e or \u003ca href=\"https://www.w3.org/TR/xmlschema11-2/\" rel=\"nofollow\"\u003ePart 2\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eXML allows syntax extensions using structures, such as the \u003ccode\u003e\u0026lt;any\u0026gt;\u003c/code\u003e element information item in XML Schema. If your XML defines and extension mechanism then:\u003c/p\u003e\n\u003cul class=\"contains-task-list\"\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Ensure the I-D contains clear guidance on how, when, and where any extension structures, such as versioning, can be used.\u003c/li\u003e\n\u003cli class=\"task-list-item\"\u003e\u003cinput type=\"checkbox\" id=\"\" disabled=\"\" class=\"task-list-item-checkbox\" checked=\"\"\u003e Check that any new or updated XML Schemas, Namespaces, and Resource Description Framework (RDF) Schemas are being registered with IANA using the procedures described in RFC 3688.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch1 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eProgramming languages\u003c/h1\u003e\u003ca id=\"user-content-programming-languages\" class=\"anchor\" aria-label=\"Permalink: Programming languages\" href=\"#programming-languages\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eWhen programming languages are used in Internet-Drafts, you must include as a reference the formal definition of that coding language (e.g., \u003ca href=\"https://www.iso.org/standard/29237.html\" rel=\"nofollow\"\u003eC99\u003c/a\u003e).\u003c/p\u003e\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":null,"showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":false,"symbols":[{"name":"ABNF","kind":"section_1","ident_start":470,"ident_end":474,"extent_start":468,"extent_end":962,"fully_qualified_name":"ABNF","ident_utf16":{"start":{"line_number":15,"utf16_col":2},"end":{"line_number":15,"utf16_col":6}},"extent_utf16":{"start":{"line_number":15,"utf16_col":0},"end":{"line_number":22,"utf16_col":0}}},{"name":"MIB 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0 0 3Z"></path></svg></button></div></div></div></div><div></div></div><div class="Box-sc-g0xbh4-0 hGyMdv"><section aria-labelledby="file-name-id-wide file-name-id-mobile" class="Box-sc-g0xbh4-0 fGqKFv"><div class="Box-sc-g0xbh4-0 eoaCFS js-snippet-clipboard-copy-unpositioned" data-hpc="true"><article class="markdown-body entry-content container-lg" itemprop="text"><markdown-accessiblity-table><table> <thead> <tr> <th>title</th> <th>description</th> <th>published</th> <th>date</th> <th>tags</th> <th>editor</th> <th>dateCreated</th> </tr> </thead> <tbody> <tr> <td><div dir="auto">Formal languages</div></td> <td><div dir="auto"></div></td> <td><div dir="auto">true</div></td> <td><div dir="auto">2021-12-16 04:44:58 UTC</div></td> <td><div dir="auto"></div></td> <td><div dir="auto">markdown</div></td> <td><div dir="auto">2021-12-11 22:42:14 UTC</div></td> </tr> </tbody> </table></markdown-accessiblity-table> <p dir="auto">There are a number of formal languages used in I-Ds and several tools have been written to help process them.</p> <blockquote> <p dir="auto">Make sure that any use of formal languages conforms with the <a href="https://www.ietf.org/about/groups/iesg/statements/formal-languages-use/" rel="nofollow">IESG statement on the use of formal languages</a>. {.is-success}</p> </blockquote> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">ABNF</h1><a id="user-content-abnf" class="anchor" aria-label="Permalink: ABNF" href="#abnf"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">ABNF is a general purpose formal grammar notation specified in STD 68 (RFC 5234).</p> <p dir="auto"><a href="https://github.com/ietf-tools/bap">bap</a> can extract and validate ABNF. It can be run locally on the command-line, or using <a href="https://author-tools.ietf.org/abnf" rel="nofollow">the online services at author-tools.ietf.org</a>. The utility provides the ability to validate ABNF and to extract ABNF from an I-D or RFC.</p> <p dir="auto">When ABNF is used, your I-D must contain a normative reference to RFC 5234, the specification for ABNF.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">MIB modules</h1><a id="user-content-mib-modules" class="anchor" aria-label="Permalink: MIB modules" href="#mib-modules"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">MIB modules are collections of related objects of SMIv2 management information specified in STD 58 (RFC 2578, RFC 2579, RFC2580).</p> <p dir="auto">All MIB modules must follow the "Guidelines for Authors and Reviewers of MIB documents" (RFC 4181). When using the tools below, please evaluate all diagnostic messages and if in doubt, feel free to check on the <a href="https://www.ietf.org/mailman/listinfo/IETFMIBS" rel="nofollow">ietfmibs mailing list</a> or with the OPS ADs.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">libsmi</h2><a id="user-content-libsmi" class="anchor" aria-label="Permalink: libsmi" href="#libsmi"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://www.ibr.cs.tu-bs.de/projects/libsmi/download.html?lang=de" rel="nofollow">libsmi</a> suite of tools and is available as a <a href="https://command-not-found.com/smilint" rel="nofollow">package</a> for most operating systems and as an <a href="https://www.ibr.cs.tu-bs.de/projects/libsmi/tools/" rel="nofollow">online service</a>. libsmi contains three command line tools:</p> <ul dir="auto"> <li>smilint for checking a MIB file</li> <li>smistrip for extracting a MIB from a document</li> <li>smidump for converting a MIB into another format (including YANG)</li> </ul> <p dir="auto">MIB modules with the correct syntax will compile cleanly using smilint, e.g.:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="smilint -m -s -l 6 -i namelength-32"><pre>smilint -m -s -l 6 -i namelength-32</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">rfcstrip</h2><a id="user-content-rfcstrip" class="anchor" aria-label="Permalink: rfcstrip" href="#rfcstrip"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/mbj4668/rfcstrip">rfcstrip</a> extracts code components, YANG modules and SMIv2 (MIB) modules from RFCs and I-Ds, and extracts and unfolds artwork from RFCs and I-Ds in XML format.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">YANG</h1><a id="user-content-yang" class="anchor" aria-label="Permalink: YANG" href="#yang"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">YANG (Yet Another Next Generation) is a data modeling language for data sent over network management protocols such as NETCONF and RESTCONF specified in RFC 7950, RFC 8340 and many others</p> <p dir="auto">All YANG modules must follow the "Guidelines for Authors and Reviewers of YANG Data Model Documents" (RFC 8407) and the <a href="https://trac.ietf.org/trac/ops/wiki/yang-security-guidelines" rel="nofollow">YANG module security considerations</a>.</p> <p dir="auto">When YANG is used, your I-D must contain normative references to RFC 8446, RFC 6241, RFC 6242, RFC 8341, and RFC8040.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">YANG Catalog</h2><a id="user-content-yang-catalog" class="anchor" aria-label="Permalink: YANG Catalog" href="#yang-catalog"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://www.yangvalidator.com/" rel="nofollow">YANG Catalog</a> is a website operated and maintained by the IETF that provides a central resource for the use of YANG, including the <a href="https://www.yangvalidator.com/yangvalidator" rel="nofollow">YANG Validator</a>. YANG Catalog is <a href="https://github.com/YangCatalog">open source</a>.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">pyang</h2><a id="user-content-pyang" class="anchor" aria-label="Permalink: pyang" href="#pyang"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/mbj4668/pyang">pyang</a> is an open source tool that validates YANG modules and converts them into other formal languages. pyang has a flag <code>--ietf</code> that checks RFC 8407 rules.</p> <p dir="auto">The RFC editor ensures that all published YANG modules are formatted consistently using pyang as follows:</p> <div class="highlight highlight-source-shell notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="# ensure that the module fits into the line limits of an I-D pyang --ietf --max-line-length 69 FILE # format the module pyang -f yang --keep-comments --yang-line-length 69 FILE"><pre><span class="pl-c"><span class="pl-c">#</span> ensure that the module fits into the line limits of an I-D</span> pyang --ietf --max-line-length 69 FILE <span class="pl-c"><span class="pl-c">#</span> format the module</span> pyang -f yang --keep-comments --yang-line-length 69 FILE</pre></div> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">libyang</h2><a id="user-content-libyang" class="anchor" aria-label="Permalink: libyang" href="#libyang"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/CESNET/libyang">libyang</a> is an open source YANG data modelling language parser and toolkit that includes the <a href="https://github.com/CESNET/libyang/blob/master/tools/lint/examples/README.md">yanglint</a> command line tool for validation and conversion of the schemas and YANG modeled data.</p> <div class="markdown-heading" dir="auto"><h2 tabindex="-1" class="heading-element" dir="auto">xym</h2><a id="user-content-xym" class="anchor" aria-label="Permalink: xym" href="#xym"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto"><a href="https://github.com/xym-tool/xym">xym</a> is an open source tool for extracting YANG modules from files. See also <a href="#rfcstrip">rfcstrip</a>.</p> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">XML</h1><a id="user-content-xml" class="anchor" aria-label="Permalink: XML" href="#xml"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">Protocol specifications that use XML should always use well-formed XML at a minimum. Sample XML instances included in a specification have to be well-formed, and if the XML is supposed to be valid (according to the current W3C definition of validity), the samples must reference and be validated using an appropriate XML Schema, DTD, or another standard validation mechanism that is structurally and syntactically correct.</p> <p dir="auto">Other guidelines for the use of XML in IETF protocols can be found in RFC 3470. Internet-Drafts that include an XML Schema should include a normative reference to either the W3C XML Schema Definition Language 1.1 <a href="https://www.w3.org/TR/xmlschema11-1/" rel="nofollow">Part1</a> or <a href="https://www.w3.org/TR/xmlschema11-2/" rel="nofollow">Part 2</a>.</p> <p dir="auto">XML allows syntax extensions using structures, such as the <code><any></code> element information item in XML Schema. If your XML defines and extension mechanism then:</p> <ul class="contains-task-list"> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Ensure the I-D contains clear guidance on how, when, and where any extension structures, such as versioning, can be used.</li> <li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> Check that any new or updated XML Schemas, Namespaces, and Resource Description Framework (RDF) Schemas are being registered with IANA using the procedures described in RFC 3688.</li> </ul> <div class="markdown-heading" dir="auto"><h1 tabindex="-1" class="heading-element" dir="auto">Programming languages</h1><a id="user-content-programming-languages" class="anchor" aria-label="Permalink: Programming languages" href="#programming-languages"><svg class="octicon octicon-link" viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z"></path></svg></a></div> <p dir="auto">When programming languages are used in Internet-Drafts, you must include as a reference the formal definition of that coding language (e.g., <a href="https://www.iso.org/standard/29237.html" rel="nofollow">C99</a>).</p> </article></div><button hidden=""></button></section></div></div></div> <!-- --> <!-- --> </div></div></div><div class="Box-sc-g0xbh4-0"></div></div></div></div></div><div id="find-result-marks-container" 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